DC apparently eliminated one more on the '02 2wd trucks - I only have 2 on mine...
Some of us who are sorta concerned with proper longevity of the un-greasable joints, have used needle tips on our grease guns and carefully pierced the joint boots and injected grease into them - and the center carrier boot as well. On my truck, the boots were quite obviously deflated and empty of lubricant - I added enough grease to get them to begin "plumping up", and stopped there. After a couple of drives, I rechecked the various joints, and saw that they had lost their plumpness as apparently captured air was eventually bled out. You DO need to be careful to NOT over greae these joints, as the boots are a sealed type that can be damaged if overfilled.